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The mitochondrion of Plasmodium falciparum visualized by rhodamine 123 fluorescence
Abstract:
Rhodamine 123 (Rh123) has been used to probe the functional status of the mitochondrion present within the asexual, intraerythrocytic stages of the malarial parasite Plasmodium falciparum. This cationic fluorescent dye accumulates specifically in negatively charged cellular compartments, such as mitochondria. Using epifluorescence microscopy the development of what appears to be a single mitochondrion has been followed through the intraerythrocytic cycle. Mitochondrial development progresses from a fine thread-like organelle that becomes longer and eventually branched. Each daughter merozoite receives a branch or piece of the parent organelle. Cytoplasmic Rh123 accumulation was also observed, indicating that there exists a transmembrane potential across the outer plasma and parasitophorous vacuolar membranes of the parasite. The effects of uncouplers (protonophores), ionophores, and inhibitors were examined by monitoring Rh123 accumulation and retention. Our results demonstrate that the mitochondrion of P. falciparum actively maintains a high transmembrane potential, the function of which is as yet undefined.
Insights
Rhodamine 123 reveals the malaria parasite Plasmodium falciparum mitochondrion develops and divides. This organelle maintains a significant transmembrane potential crucial for parasite survival.
Area of Science:
- Cell Biology
- Parasitology
- Biochemistry
Background:
- The malaria parasite Plasmodium falciparum undergoes asexual intraerythrocytic stages.
- Mitochondria play vital roles in cellular functions, including energy metabolism.
- Understanding Plasmodium falciparum mitochondrion is crucial for developing antimalarial strategies.
Purpose of the Study:
- To investigate the functional status and development of the Plasmodium falciparum mitochondrion during its asexual intraerythrocytic stages.
- To characterize the mitochondrial transmembrane potential using Rhodamine 123.
Main Methods:
- Epifluorescence microscopy was employed to visualize the mitochondrion.
- The cationic fluorescent dye Rhodamine 123 (Rh123) was used to probe mitochondrial function.
- The effects of uncouplers, ionophores, and inhibitors on Rh123 accumulation were assessed.
Main Results:
- Rhodamine 123 selectively accumulated in the Plasmodium falciparum mitochondrion.
- Mitochondrial development was observed, progressing from a thread-like structure to a branched organelle distributed among daughter merozoites.
- A significant transmembrane potential was detected across the parasite's outer membranes and parasitophorous vacuolar membranes.
Conclusions:
- The Plasmodium falciparum mitochondrion undergoes dynamic development and division throughout the intraerythrocytic cycle.
- The parasite's mitochondrion actively maintains a high transmembrane potential.
- The precise function of this high transmembrane potential in Plasmodium falciparum remains to be elucidated.